OTWO: Science allows for wrong understandings. Just produce some actual proof and the atheist will look at it. If your God exists and you can prove it, then things will have to be reevaluated. Until then, there is no proof of your god.
.
Science has systems built into it that actually seek to prove current understandings incorrect. If evidence presents itself which modifies or nullifies prior theory, then appropriate adjustments are made.
.
In contrast, religion has systems in place that only support itself as being right, despite all evidence to the contrary.
.
I think I can safely say that if there is a god and he presented himself to all humanity with irrefutable evidence, every atheist would then have a valid reason to change their mind.